Hi Felix, I had similar issues but using TLS https://lists.nongnu.org/archive/html/lwip-users/2020-05/msg00006.html
I experience the same: some requests are very quick and others take seconds. ..but didn't found a solution yet. I will follow this thread in case someone comes with more suggestions. I suggest you can start trying to increase MEMP_NUM_TCP_PCB to the double I think play with smaller values in TCP_MSS and/or TCP_WND could help.. but not sure... Mario ________________________________________ From: lwip-users <lwip-users-bounces+mrluzeiro=ua...@nongnu.org> on behalf of Felix Frey <f...@stettbacher.ch> Sent: 17 August 2020 14:40 To: lwip-users@nongnu.org Subject: [lwip-users] very poor performance of httpd Hi, I've running an application on a STM32F429 using LwIP 2.0.3 and it's httpd. Basically it works fine, however the performance of the httpd is very poor. When the browser does a http request for a total of five files (statically linked) with a total amount of 40kB, it takes about 5sec to complete the request. It seems like the httpd gets stalled. In the log I can see several of the entrys below: ----- 00006.560: http_poll: pcb=0x2000d7b8 hs=0x2000db08 pcb_state=ESTABLISHED 00006.560: http_poll: try to send more data 00006.560: http_send: hs=0x2000db08 pcb=0x2000d7b8 left=22030 00006.560: Trying to send 0 bytes 00006.560: Sent 0 bytes 00006.560: send_data end. 00006.560: tcp_output ----- This is repeated every 500ms for about 2sec until sending moves on. It looks like it simply doesn't anything during this time. Why?? My memory settings are: #define MEM_LIBC_MALLOC 1 #define MEMP_NUM_TCP_PCB 8 #define MEMP_NUM_PBUF 32 #define TCP_MSS 1460 #define TCP_WND 2920 I've already played with configuration settings, however, it didn't change a lot. Can anybody explain this behaviour or even help to improve it? Thanks in advance. Felix _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
